High Aspect Ratio Drilling of PCB's With Micro Drills

摘要

High Aspect Ratio Drilling of PCB's with Micro Drills Market requirements: The market requires hole sizes in PCBs of <= 0,5 mm dia. The aspect ratio of 20 x dia. is a criteria which will have to be met out of cost reasons. Methods: Carbide: The raw material (tungsten carbide) is of utmost importance. A very high degree of transrupture strength (3.600N/mm~2) in conjuction with ultra micro grain carbide 0,3 - 0,5 my.